Sierra Plain refers to a type of Apachean pottery produced over large areas in Southeastern Arizona, Southern New Mexico, West Texas known to have been occupied by Chiricahua and Mescalero Apache groups ( Seymour 2002, 2004, 2008). Sierra Plain was described by Seymour (2002) and is distinguished from "Apache" gray wares by red to brown pastes indicative of the use of high-iron clays (Seymour 2008). The presence of dark gray paste of some example may indicate the use of organic rich clay deposits or low firing temperatures as is typical of this period (Seymour 2002, 2008). Temper is sometimes represented by angular quartz and white feldspar and the combination of brown pastes and temper is sometimes similar in Jornada Mogollon Brown Wares and results from the use of similar clay sources that are largely self tempered. Surfaces are unpolished. Vessel shape when evident indicates pointed bottom wide-mouthed vessels with Apache shape.